IMPL: "New button in main window"
FIX: do not withdraw unless we have a tray
FIX: initialization on case of no tray
DOC: todo update
FIX: failure at start
FIX PARTIAL: do not handle FocusOut - too unreliable

instead hide main when appropriate.
Still does not focus sometimes
FIX: force focus
IMPL: loading config
IMPL: rename font used for texts

by default was TkFixedFont
Revert "IMPL: rename font used for texts"

This reverts commit 0526d8f9db566a06e1b6bb95b5c0ede9ea4827a5.